Sure, the trials have been available for months now. It's the same dev as the Five Days with Succubus game and he's improved a lot on what was good (and bad) about that game. Much more of an actual narrative, a proper antagonist and much more content. There will be a pure love route, and while the netorare itself is indeed mystery, it's to differing degrees throughout.
The main, and most interesting, gimmick here is the way the netorare and combat is fused together. Basically, you and the heroine traverse the same locations but in different planes of existence, you open doors for her, weaken the strength of enemies she faces by killing them on your side, stuff like that. By the same token, the heroine will fight her own way through the locations and can be worn down and forced to rest, when this happens, the antagonist will often take the opportunity to lay his hands on her. What's great about this and the mystery angle, is that you have a heart rate monitor tied to the heroine which tells you her pulse at all times, when it hikes up you don't know if she's just fighting an intense battle or if she's being taken advantage of... Which ties into the security room gimmick. You can place security cameras around the locations to spy on rooms, follow her progress and, on occasion, see for yourself what's happening to her (and stop it, if you want). There's also two kind of cameras, those which let you see everything, and those too blurry to make out well (and which also obfuscate the dialogue, which I like).
The gameplay cycle basically consists of exploring these locations during the day, and town exploration and minor tasks at night. You have a lot of ways of passing time in these segments (too many, really, there's a lot of walking around to do), but the main thing is either dating the heroine or allowing the antagonist to perhaps make his move. Again, plenty of light mystery as most scenes are hidden just enough that the protagonist won't recognize what's really happening. There's also elements using your phone; the ability to call the heroine, check her sexual statistics, and browse the antagonist's twitter feed with his recent conquests, etc.
It's a bigger project, and a bigger upgrade, on the dev's previous work and definitely one I'm waiting to see the full release of.
